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No. 99MBC071A
3. DISPLAYS AND KEY OPERATIONS
3.2.9 Offset/Zero-set
This function is used to measure the difference between the workpiece and the reference gage
or to measure the workpiece that is larger than the measuring range of the LSM.
a) Offset
• In this system the operation of setting the reference gage dimension is called the
offset operation.
• This function is applied to measure the absolute dimension of a workpiece.
b) Zero-set
• Setting the reference gage dimension to “0.0” for the purpose of comparing it with a
workpiece dimension is called the zero-set.
• This function is applied to measure a deviation from the reference gage dimension.
c) Direction
Depending on the objective portion of measurement of a workpiece, the positive
direction (set as “0”) or negative direction (set as “1”) must be set.
If, for example, the shaded portion of D in the following diagram is measured, the
direction must be set as positive (0). If the highlighted portion (gap) of W is to be
measured for determining the workpiece dimension L, the direction must be specified
as negative (1).
D
W
L
Reference piece
Reference
lane
Workpiece
Workpiece
Set as positive (0) Set as negative (1)
• Offset operation takes about 1 second to determine the compensation value by measuring
the reference gage.
• Offset value will be ineffective if the segment or edge number is changed (Offset value is
unique to each segment or edge).
NOTE • About the gap measurement.
If it is necessary to measure Segment 1 in such as a runout measurement, use a
reference pin or knife-edge at the focus position, as shown in the diagram below.
If this reference pin is not used, repeatability will be reduced.
SEG1
Workpiece
Reference pin or knife-edge
